Cutter-tool.



No. 663,455. Patented nec. n, labo.

K. o. MUEHLBEHG.

CUTTER TOUL'.

(Applicatiovn filed Dec. 18, 1899.)

ma Medel LIIA UNITED STATES PATENT OFFICE.

KARL O. MUEHLBERG, OF BRADDOCK, PENNSYLVANIA.

CUTTER-TOOL'.

SPECIFICATION forming` part f Letters Patent NO. 663,455, dated December11, 1900.

I Application filed December 18, 1899- Srial No. 740.819. (No modelJcylindrical holes in metal bodies of any form or character; and ithasfor one of its objects to provide a tool of this character the cuttersofy which may be readily adjusted to operate upon tubes of diderentdiameters or to rearn out a tube of a given diameter to diiferent depthsmeans shown in the accompanying drawings,

in which- Figure 1 is a side elevation of the cutterhead and cuttersmounted in a suitable holder in operative position, the holder and atube upon which work is to be done being shown partially in section andparts being broken away.

central longitudinal section through the cutter-head, taken at rightangles to that of Fig. 2. Fig. 4 is a detail sectional view of a portionof the cutter-head, showin" the cutter and its adjusting and lockingdevice in dif` ferent positions from those represented in Figs. 2 and 3.

Referring now to the details of construction illustrated in thedrawings, the holder or boring-bar l has a tapered end portion 2,adapted to be inserted in a lathe-chuck or boring-lna-- chine clamp inorder that the holder may be Fig. 2 is a central longitudinal sec-A tionthrough the cutterhead;l and Fig. 3 is ay properly centered and `rigidlyheld for rotation.- The central portion of the holder is provided with arectangular opening 3, eX-

' tending through it from side to side, in which located a cutter-head4, the latter'being provided with a central opening 5, through whichextends a pin 6 of smaller diameter, this pin and opening'serving toretain the cutter-head in the holder, but by reason of the difference indiameter between the two permitting the head to move back and forth inits seat suiiciently to adjnstitself with reference to the materialoperated upon. p

The head 4 is provided at each endy with a slot-7, in which ts asubstantially circular cutter S, having a sphericalicutting `edge 9 anda central tapered opening 10. lIn employing the term spherical to definethe form of the cutting edge I mean to indicate that the'cutter isAinthe form of a segment Yof a sphere having parallel circular sides ofdifferent diameter. While the 'cutters employed by me are shown ascircular in form and the functions performed render the circular form`partic'ularl y advantageous, I desire and intend to include within thescope of my invention all variations from the circular form that do notrob the cutter of its essential functional characteristics. Ascrewthreaded opening l1 communicates from each slot with one side faceof the head, this opening being arranged at right angles to the slot 7,Seated in each screw-th readed opening 11 is a screw 12, having atapered inner end of such form and size as to lit the.

tapered openingvin the cutter. Extending longitudinally from the base ofeach slot 7 ing 15 extends outwardly at right angles I thereto lto oneof the edge faces of the head, and in this opening is seated a screw 16,having a tapered inner end, the base of the opening being taperedtocdnform to the end of the screw. In order to set the cutters inoperative position, the screws 12 and 1G are screwed home, so`as to holdthe cutters rigidly in the head. If it is desired to increase thediameter ofthe cut, the screws 12 are loosened and in the slots 7, aswill be readily understood.l

The screws l2 'and 16 and the pins 14- are made of hardened steel, andtherefore servev to hold the cutters securely in any position to whichthey may be adjusted. In case the two cutters are not adjusted toexactly the same distance from the center of the head the play betweenthe opening 5 and the pin 6 will enable the head'to automatically adjustitself to the work.

It will be seen upon reference to Fig. 1 that the tube 17 is cut by onlya comparatively small portion of the spherical cutting edge of eachcutter 8, and it therefore is feasible to securela large number ofsubstantially new sharp cutting edges without grinding the cuttersor'substituting new ones therefor, but merely loosening the screws 12and partially rotating the cutters to bring a new portion of the cuttingedge into working position.

The tool constituting my invention and here described and illustratedmay be ad vantageously used in any style of lathe, drillpress, orboring-mill and is both a right and a left boring-tool, as will bereadily seen.

While I have illustrated and described my invention as embodied inaspecitic structure, I desire it to be understood that the details asregards form and relative location of parts may be variedwithinconsiderable limits without departingfrom the spirit and scope ofmy invention.

What I claim as myinvention, and desire to secure by Letters Patent, is-

1. A boring or reaming tool comprising a cutter head, a circular cutterrotatably mounted therein on an axis at right angles to and notintersecting the axis o f the head, means for adjusting the cutter todifferent distances from thecenter of the head and means for locking thecutter immovably in any position to which it may be adjusted.

2. A boring or reaming tool comprising an oblong head. having end slotsand screwholes communicating laterally with said slots, circular cuttershaving central conical apertures and seated in said slots and screwshaving conical ends .nd seated in said holes and projecting into saidapertures.

3. A boring or reaming tool comprising an oblong head having end slots,a screw-threaded opening extending from each slot to one face, a .recessextending longitudinally from the base o f each slot toward the centerof the head and the screw-threaded opening extending from the base ofsaid recess at right an gles thereto, a piu in said longitudinal recess,circular cuttershaving central openings and seated in said slots andscrews having tapered ends and adjustable insaid screw-threaded openingsto adj ust said cutters and lock them in position.

4. The combinationv with a holder, of an oblong cutter-head'mountedtherein and provided at 4eachnsnd with a rotatably-mounted circularcutter Aand with ineanslfo'r adjusting the cutters toward and away fromthe holder and for locking thgm in any position towhich they may beadjusted. j

5. A boring or reaming tool comprising a holder, an. oblong cutter-headmounted to center itself in said holder, and a circular cutter rotatablymounted in each end of said head.

6. Aboring or reaming tool comprising holder, an oblong cutter-headmounted to center itself in said holder,a cutter `mounted in each end ofsaid head, and means for adjusting the cutters toward and away from theholder.

7. The combination with a holder having a transverse slot, ofacutter-head mounted to center itself in said slot, said head having acircular cutter rotatably mountedin each end and means for adjustingsaidv cutters toward and away from the holder and for locking themimmovably in any position to which they may be adjusted.

8. A boring or reaming tool comprisinga head and a circular cuttermounted therein on an axis at right angles to but not intersecting theaxis of the head, said cutter being adjustable on its axis and alsotoward and away from the center of the head.

In testimony whereof I, the said KARL O. MUEHLBERG have hereunto set myhand.

KARL O. MUEHLBERG.

Witnesses:

GRACE C. RAYMOND, ROBERT C. To'r'rEN.

IOO

